Steam-boiler.



C. D. MOSHER.

STEAM BOILER.

APPLICATION FILED IAN-3],,I9I2- Patented Aug.v 1, 1916.

Ououn l'II IIIIIIIJIIII'I INVENTOR Mam I/I/ITNESSES JM%,% B M ,qrromvsys I I UNITED STATES PATENT OFFICE.

cHAELEs D. MosHEE, OF NEW YORK,

N. Y.,.ASSIGNOR, BY MESNE ASSIGNMENTS, TO

THE IBABCOOK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A. CORPORATION OF NEW. JERSEY.

STEAM-BOILER.

Patented Aug. 1. 1916.

Application filed January 31, 1912. Serial No. 674,627.

To all whom it may concern Be it known that I, CHARLES D. Mosinan,

a citizen-of the United States, residing in the borough of Manhattan of the city of New York, in the State of New York, have invented certain hew and useful Improvements in Steam-Boilers, of which .the following is a specification, reference being hadto the accompanying drawings, which form a part hereof.

The object of this invention is to promote the combustion'of fuel in the furnaces of steam boilers, and particularlyof boilers of water tube type.

It is well known that in order to obtain the most perfect combustion ,the gases should be burned in a chamber completely surrounded by fire brick or other refractory material. and further should be thoroughly mixed with the necessary air. while the furnace should be so arrangedthat if there is any excess of air or-gas locally distributed in any part it will be mixed with the bulk of gas and so averaged and burned before entering among the tubes. Experience has proved that the ases, when brought in contact with the tiibesurface of a boiler, are cooled down below the temperature of combustion and are extinguished and that in order that complete and smokeless combustion may take place the fuel gases should be.

burned in a brick chamber before they enter among the tubes. To insure these necessary conditions in boilers of the type referred to,

and thereby attain the purpose of the inven-- tion there is arranged above the main zone of combustion, whether of solid, liquid or gaseous fueLa perforated screen of refractory material which becomes incandescent and thereafter, by maintaining a zone of intense heat at some distance above the tire,

promotes the complete combustion ,of gases which, though released by the fire, pass off in a state of incomplete combustion. The intense heat of the screen causes the screen to act as an igniter for the unburned gases which pass through its perforations and the screen also forms, in effect, a secondary combustion chamber above the primary or main combustion chamber. It actsv also as a mixer of the gases which pass off from the fire and in this way promotes combustiom In addition to the air which is admitted. through the primarycombustion chain l ieii and is suliicientto support combustion ther-rin, it is generally desirable to admit additional air in proximity to the screen to. su-pport combustion of the gases which takes place above the screen, the incoming air currents. also acting as stirrers to promote further the mixture of the gases. tically impossible tomake aperforated archof the usual construction stand-in such a location and therefore, in accordance with the present invention, it is supported by gener- It is pracating tubes of the. boiler itself, sincesuch 1 tubes, being filled with water and forming part ofthe circulatory system of the boiler,

are thereby preventedfrom being burned out by the intense heat in the combustion chamber. have such tubes protected from the impingement of burning gases by the refractory material of which the screen is' forme'd. The invention is capable of application to boilers of different types and is illustrated in the accompanying drawings as embodied in boilers of difi'erent types.

In such diawings liigure l-is a view in vertical.transverse section of a portion of a water tube boileradaptedfor oil fuel-and to which the invention is'applied. Fig. 2 1s a view of the same in'longitudinal. vertica-l section. Flg. 3 1s a new similar-.toFig.

1 but showing a boiler adapted for solid fuel. Fig. 4 is a view in longitudinal, ver- Itis. preferable, moreover, to

tical section of the boiler illustrated in Fig.

3. Fig. 5 is a detail view of the perforated screen,-show1ng its construction. Fig. '6 is a view 1nperspectiveshowing two of the blocks or elements of the. screen shown in.

Fig. 5,. and Fig. '7 is a'sectional View showing the invention applied to another type of boiler. i

The boiler shown in Figs. 1 and 2 cornprlses acaslng a, a steam drum' or header 7),

two water drums or headers, one of which is shown at 0 while. the other is similarly placed at the opposite side of-the longitudinal axis of the boiler, water tubes (Z which connect the steam drum or header with the water drum or header on the same'side. and a single series or row of water tubes (1 which also connect the water drum or header and the steam drum or header and serve as a support for the reverberatory arch or screen of refractory material. there being a similar "series of tubes 6' to supporta similar screen at the opposite side of the boiler. In the.

form of boiler ihdicated the screen is slightly inclined and the .tubes are therefore extended inward from the water drum 0 in an upwardly inclined direction toward the axis of the boiler and are'then bent upward toward the steam drum b. Upon the inclined portions of the tubes e is supported the perforated refractory arch or screen 7 of refrac tory material. Such arch or screen may be ping ed es as at f so as to break the joints.

between adjacent blocks. No burner nozzles for either fuel oil or fuel gas are shown in .Figs. 1 and 2, but it is presumed that this boiler is adapted for the burning of either fuel oil or fuel gas, there-being no. grate bars shown. The fire-brick walls 9 are shown as provided with openings 9 for the admissionof additional air in proximity to the screen to mix thoroughly the gases which pass off from the primary combustion chamber and to support the combustion of such gases when they are ignited by the incandescent screen, which ignites the gases and promotes the mixture thereof as well.

' The boiler shown in Figs. 3 and 4 is gen-- erally similar to that shown in Figs. 1 and 2, comprising a casing a, a steam drum 6,

water drum 0-,, water tubes (Z, and additional series of water tubes 6 and e which support the perforated screen 7. It is assumed that this boiler, however, is adapted for the burning of solid fuel,a grate being shown at h.

40 The fire-brick walls are also shown as provided with openings 9 for the admission of air in proximity to the screen. The boiler shown in Fig. 7 is of a difiernt form from that shown in Figs. 1 and 3, comprising a casing a, a steam drum 6 and a single water drum 0' connected by water tubes (1 with the steam drum. In this boiler there is also shown a single series or row of Water tubes'e which are extended in an upwardly inclined direction from the water- 3 and 7 the perforated reverberatory arch or 'screen is shown as slightly inclined, forming a secondary combustion chamber between the screen and the water tubes.

Various other "applications and embodiments of the'invention will readily suggest themselves and it will be understood that the invention is not restricted to the particular arrangements nor to the particular details,of construction. of the perforated screen shown and described herein and may be applied to boilers of various types.

I claim as my invention 2- In a water tube boiler of the inclined bank type, acombustion chamber having refrac: tory side walls and provided With a perforated refractory screen arranged below and at an angle to the bank of tubes and through which the gases rise before reaching the tubes, said screen forming a secondary combustion chamber of general triangularform between it and the bank of tubes, and water tubes supporting said refractory screen and connected at their ends to upper and lowerwater spacesof the boiler, the refractory side walls of the setting having air inlet openings in proximity to the refractorv screen to aid the secondary combustion; substantially as described. I

This specification signed and witnessed this 30th day of J a'nuary A. D., 1912.

CHARLES D. MOSHER. Signed in the presence of D. DAMES, WORTHINGTON CAMPBELL.

Copies of this batent maybe obtained for five cents each, by addressingthe fGommissioner of Patents,

Washington, D. 0." t i It is hereby certified that in Lettere Patent" No. 1,192,928, granted August 1,

1916, upon the application of Civ l-163D. Mqsher, of New York, N. Y., for an improvement in Steam-Boilers, zin erroi v printed specificationrequiring correction as follows: Page 'l lin e 32,, afte1' the yord brick insert the word)- lined; and that the said Letters 1 at1;ph u1d bei'eedwith this eorrection therein that the same may conforrnto the reeord of the casein th e Pateht Oflice;

Signed and sealed this 22d day of August, A. D.,f 19 16. [SEAL] I Y F; W. CLAY,

Acting Commissioner of Patents. 

